Abstract
Glyphosate-resistant giant ragweed in Arkansas was reported in 2005. A study was conducted to (1) confirm and characterize the glyphosate resistance in giant ragweed, (2) determine if reduced absorption or translocation is the mechanism of glyphosate resistance in giant ragweed, and (3) evaluate the efficacy of nine POST-applied soybean herbicides to control glyphosate-resistant and -susceptible giant ragweed. Based on the rate required to kill 50% of plants (LD 50 values), resistant giant ragweed biotypes from Greene and Jefferson counties were 2.3- to 7.2-fold less sensitive to glyphosate compared to susceptible biotypes. Glyphosate absorption and translocation for glyphosate-resistant and -susceptible biotypes was similar at 24 and 72 h after treatment. Thus, differential absorption or translocation is not a mechanism of glyphosate resistance in this resistant giant ragweed biotype. Control of resistant giant ragweed biotypes with glyphosate at a labeled field application rate of 840 g ha −1 was only 60% or less compared to complete control of a susceptible giant ragweed biotype. However, bentazon, carfentrazone, cloransulam, and fomesafen controlled both biotypes more than 95%.
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Claims 5
Claim · model-written summary
Resistant giant ragweed biotypes were 2.3- to 7.2-fold less sensitive to glyphosate than susceptible biotypes
- Taxon
- giant ragweed
.jpg?width=60)
Ambrosia trifidae0 - Material
- resistant giant ragweed biotypese0
- Treatment
- glyphosatee0
- Outcome
- sensitive to glyphosatee0
- Direction
- lesse0
- Value
- 2.3- to 7.2-folde0
- Comparator
- susceptible biotypese0
- Setting
- Greene and Jefferson countiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Giant Ragweed (Ambrosia trifida)”
e0“resistant giant ragweed biotypes from Greene and Jefferson counties were 2.3- to 7.2-fold less sensitive to glyphosate compared to susceptible biotypes”
Claim · model-written summary
Glyphosate absorption and translocation were similar in resistant and susceptible giant ragweed at 24 and 72 h
- Taxon
- Giant RagweedAmbrosia trifidat0
- Material
- glyphosate-resistant and -susceptible biotypese1
- Outcome
- absorption and translocatione1
- Qualifier
- at 24 and 72 h after treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Giant Ragweed (Ambrosia trifida)”
e1“Glyphosate absorption and translocation for glyphosate-resistant and -susceptible biotypes was similar at 24 and 72 h after treatment”
Claim · model-written summary
Glyphosate at 840 g ha-1 controlled resistant giant ragweed to only 60% or less, compared with complete control of susceptible biotypes
- Taxon
- giant ragweedAmbrosia trifidae2
- Treatment
- glyphosate at a labeled field application rate of 840 g ha −1e2
- Outcome
- Controle2
- Direction
- lesse2
- Value
- 60% or lesse2
- Comparator
- a susceptible giant ragweed biotypee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Giant Ragweed (Ambrosia trifida)”
e2“Control of resistant giant ragweed biotypes with glyphosate at a labeled field application rate of 840 g ha −1 was only 60% or less compared to complete control of a susceptible giant ragweed biotype”
Claim · model-written summary
Bentazon, carfentrazone, cloransulam and fomesafen controlled both resistant and susceptible giant ragweed biotypes by more than 95%
- Taxon
- Giant RagweedAmbrosia trifidat0
- Treatment
- bentazon, carfentrazone, cloransulam, and fomesafene3
- Outcome
- controlled both biotypese3
- Direction
- moree3
- Value
- 95%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Giant Ragweed (Ambrosia trifida)”
e3“bentazon, carfentrazone, cloransulam, and fomesafen controlled both biotypes more than 95%”
Claim · model-written summary
Differential absorption or translocation is not a mechanism of glyphosate resistance in this resistant giant ragweed biotype
- Taxon
- giant ragweedAmbrosia trifidae0
- Compound
- glyphosatee4
- Outcome
- mechanism of glyphosate resistancee4
- Qualifier
- differential absorption or translocatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Giant Ragweed (Ambrosia trifida)”
e0“resistant giant ragweed biotypes from Greene and Jefferson counties were 2.3- to 7.2-fold less sensitive to glyphosate compared to susceptible biotypes”
e4“Thus, differential absorption or translocation is not a mechanism of glyphosate resistance in this resistant giant ragweed biotype”
The same questions in other papers
bentazone · control · Ambrosia trifida (giant ragweed)Positive and negative results
1 in the opposite direction
- negative
fomesafen · control · Ambrosia trifida (giant ragweed)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.